T13297 datetime fraction

[niden]

Hello!

• Type: bug fix
• Link to issue: [NFR] Allow size parameter for datetime and timestamp columns #13297

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Fixed Phalcon\Db\Dialect\Mysql::getColumnDefinition to recognize size for DATETIME, TIME and TIMESTAMP columns

Thanks

[codecov]

Codecov Report

Merging #14654 into 4.1.x will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            4.1.x   #14654      +/-   ##
==========================================
+ Coverage   67.46%   67.47%   +<.01%     
==========================================
  Files         483      483              
  Lines      111367   111391      +24     
==========================================
+ Hits        75139    75166      +27     
+ Misses      36228    36225       -3